Number of moles of Al = 11.7 g / 26.9815 g/mol = 0.434 mole
Number of moles of CuSO4 = 37.2 g / 159.609 g/mol = 0.233 mole
From the balanced equation we can say that
2 mole of Al requires 3 mole of CuSO4 so
0.434 mole of Al will require
= 0.434 mole of Al *(3 mole of CuSO4 / 2 mole of Al)
= 0.651 mole of CuSO4
But we have 0.233 mole of CuSO4 which is in short so CuSO4 is limiting reactant
From the balanced equation we can say that
3 mole of CuSO4 produces 1 mole of Al2(SO4)3 so
0.233 mole of CuSO4 will produce
= 0.233 mole of CuSO4 *(1 mole of Al2(SO4)3 / 3 mole of CuSO4)
= 0.0777 mole of Al2(SO4)3
mass of 1 mole of Al2(SO4)3 = 342.15 g so
the mass of 0.0777 mole of Al2(SO4)3 = 26.6 g
Therefore, the mass of Al2(SO4)3 produced would be 26.6 g
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